High-efficiency broadband anomalous reflection by gradient meta-surfaces

S. Sun, K.-Y. Yang, C.-M. Wang, T.-K. Juan, W.T. Chen, C.Y. Liao, Q. He, S. Xiao, W.-T. Kung, G.-Y. Guo, L. Zhou, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1197 Citations (Scopus)


We combine theory and experiment to demonstrate that a carefully designed gradient meta-surface supports high-efficiency anomalous reflections for near-infrared light following the generalized Snells law, and the reflected wave becomes a bounded surface wave as the incident angle exceeds a critical value. Compared to previously fabricated gradient meta-surfaces in infrared regime, our samples work in a shorter wavelength regime with a broad bandwidth (750-900 nm), exhibit a much higher conversion efficiency (?80%) to the anomalous reflection mode at normal incidence, and keep light polarization unchanged after the anomalous reflection. Finite-difference-time-domain (FDTD) simulations are in excellent agreement with experiments. Our findings may lead to many interesting applications, such as antireflection coating, polarization and spectral beam splitters, high-efficiency light absorbers, and surface plasmon couplers. © 2012 American Chemical Society.
Original languageEnglish
Pages (from-to)6223-6229
Number of pages7
JournalNano Letters
Issue number12
Publication statusPublished - 12 Dec 2012
Externally publishedYes


  • generalized Snells law
  • gradient meta-surfaces
  • high impedance surface
  • Metamaterials
  • reflection phase
  • surface waves

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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